I measure our 23" T90 (or whatever they call the new t:lock version) as:
25" for the actual tubing on the infusion set. Not including the clippy part or the t:lock part - just the actual tubing.
The little pigtail tubing coming off the cartrige - the tubing is 1-3/4".
The t:lock connection combined length including the half from the cartridge and the half from the infusion set is 1".
Total length for tubing and t:lock connection for infusion set and cartridge all the way from cartridge to actual infusion site is 27-1/2"